OBRABOTKAMETALLOV technology Vol. 27 No. 2 2025 Fig. 5. Deviation from cylindricity along the hole length – for the DMC 635 V ecoline machining center – 5 μm in diametrical terms. These results confirm the high degree of axis positioning accuracy achievable with the boring method [1, 5]. Special attention should be paid to the parameter of deviation from cylindricity. During measurements, a “conical” shape of the obtained holes was observed (Fig. 5). This phenomenon is associated with the radial displacement of the tool during machining and is directly related to the unevenness of the allowance. Radial offset has a significant effect on the diametrical size of the hole and, in combination with uneven allowance, influences the deviation from the cylindrical shape of the resulting holes. Even with small deviations from roundness in different sections along the hole’s length, a decrease in the diametrical size is observed. Therefore, by calculating the value of the radial displacement of the boring cutter, it is possible to: – predict the error magnitude in the diametrical size of the hole; – estimate the deviation from cylindricity in cases of allowance unevenness. To analyze this, let us turn to the kinematics and dynamics of the finishing boring process (Fig. 6). In the studied case, the kinematics of the cutting process is characterized as follows: – the boring tool performs mechanical processing by removing chips; – the quantitative parameters of the main and auxiliary movements are the rotation speed and feed; Fig. 6. Kinematics of the boring process
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